How we approach sliding rooflights in Dolgellau
Sliding rooflights in Dolgellau means box rooflights whose glass lid slides back for walk-out roof access. We cover the LL40 district and the rest of Gwynedd, with a survey before any price is fixed.
Slate roofs, stone cottages and terraced valleys are typical across Wales, and slim rooflights that sit low in the slates suit them best. Think of sliding rooflights for staircases that rise to a roof terrace.
Dolgellau sits about 17 km from Machynlleth and 27 km from Porthmadog, and we cover the whole LL40 postcode district and the roads in between.
Options we can specify in Dolgellau
- Electric drive with safety edge
- Box (glazed sides) or flat sliding lid
- Double or triple glazing
- Rain sensor
- Anthracite, black or RAL frames
- Electric operation with safety stops
- Glazed box sides keep the headroom open
What to check first
- Electric units need a dedicated supply and commissioning
- The stair opening and headroom must meet Building Regulations
Do you need permission in Dolgellau?
Welsh householder permitted development (Class C) allows rooflights that project no more than 15 cm and sit no higher than the existing roof — but not in conservation areas, National Parks, AONBs or World Heritage Sites. Listed buildings need listed building consent from the council, and flats have no householder permitted development rights.
Approved Document L in Wales (2022 edition) sets 2.2 W/m²K for rooflights, measured horizontally, and 1.4 W/m²K or Band B for roof windows in existing homes. A revised Welsh Approved Document L takes effect on 4 March 2027; rooflights in new dwellings stay at 2.2 W/m²K.
See our building regulations guide for U-values, glazing limits and self-certification.
What do sliding rooflights cost in Dolgellau?
Guide prices for sliding rooflights in Dolgellau are the same as anywhere we work — what changes the price is the job: access, structure, scaffold and finishing.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Large box slider with electric drive | £11,995 – £20,395 | £9,995 – £16,995 |
| Standard box slider Typical | £8,995 – £13,195 | £7,495 – £10,995 |
| Flat sliding lid | £7,195 – £9,595 | £5,995 – £7,995 |
How the job runs
- Send the details. Postcode, rough size and a photo of the roof and room.
- Survey. We measure the opening, check the roof build-up and agree the options.
- Fixed quote. Product, work and price in writing — nothing is ordered until you agree.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Nearby towns
Related work in Dolgellau
Common questions
Can children open it?
Controls can be key-switched or placed out of reach. We will set the controls up to suit the household.
Is it lockable?
Yes. Units lock from inside and the drive holds the lid closed.
Is a sliding rooflight better than an access hatch?
For daily use, usually yes — you walk out under open sky instead of climbing through a hinged hatch. A hatch costs less and suits occasional access.
Do I need to be at home for the survey in Dolgellau?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
Is the survey in Dolgellau free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
